<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="logo">
      </div>
      <!-- 登录表单区域 -->
      <el-form class="login_form" ref="loginForm" :model="loginForm" :rules="loginFormRules" label-width="0px">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user"
            placeholder="请输入用户名"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            prefix-icon="iconfont icon-3702mima"
            placeholder="请输入密码"
            v-model="loginForm.password"
          ></el-input>
        </el-form-item>
        <!-- 登录/重置 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '用户名不能为空', trigger: 'blur' },
          { min: 3, max: 15, message: '长度在 3 到 15 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '密码不能为空', trigger: 'blur' },
          { min: 3, max: 16, message: '长度在 3 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    login () {
      this.$refs.loginForm.validate(async (valid) => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 1.将登录成功的token保存到sessionStorage中
        // 1.1 项目中除了登录之外的其它API接口,必须在登录之后才能访问
        window.sessionStorage.setItem('token', res.data.token)
        // 2. 通过编程式导航跳转到后台主页, 路由地址是'/home'
        this.$router.push('/home')
      })
    },
    resetLoginForm () {
      this.$refs.loginForm.resetFields()
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  width: 100%;
  height: 100%;
  background-color: #2b4b6b;
}

.login_box {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
}

.avatar_box {
  position: absolute;
  left: 50%;
  transform: translate(-50%,-50%);
  height: 130px;
  width: 130px;
  border: 1px solid #eeeeee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px;
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.login_form {
  box-sizing: border-box;
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
